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(Nb Mod e1.) 3 sheets-Sheen] 1). W. JOHNS." I SAW FILING MAGHINE.

No. 381,249. I v Patgntd Apr. 17-, 1 888.

WITNESSES:

INVENTOR:

ATTORNEYS.

rapher. Washinghm. m1

' Patented Apr. 17, 188 8 4 J m 8 9 44 v 2 1 8 3 m INVENTOR:

WITNESSES:

ATTORNEYS;

(No Model.) 8 8 s-sneets-sht 3.

1); W. JOHNS. SAW FILING MACHINE.

N 0. 381,249. 4 I 1 I Patented Apr. "17, 1888;

, INVENTORQ- BY J *1 ATTORNEYS.

N PEIERS. Pfiamuma n hw. Wal linglnn. DJ;

NITED STATES PATENT OFF IcE;

DAvID w sHBURN JOHNS, or ALLEGHE Y CITY, PENNSYLVANIA, Ass'IeNoa or ONEHALF TO JOSEPH F. BELFOUR, on SAME PnAc S AW-FlLlNG MACHINE.

srncrrrc -rron' forming part of Letters Patent Nepalese. dated April 17,1888} Application filed November 17, 1887. Serial No. 255,430. (No modem To all whom'it may concern.-

. Be it known that. 1, DAVID WAsHBURN J oHNs,of Allegheny Qity,in thecounty of Alle= gheny and State of Pennsylvania, have in:

vented a new and Improved Saw=Filing1Vlachine, of which thefollowing is a specification,

reference being had to the annexed drawings,

forming a part thereof, in whiche Figure 1 is a plan view, partly in section, of my improved saw filing machine. Fig. 2 is a side elevation. Fig. 3 is a vertical transverse section taken on line z z in Fig. 2. Fig. 4is

a plan view with the saw and saw-carrier removed. Fig. 5 is a-partial plan view, partly in section, showing the adj ustable feeding-cam and the clamping mechanism of the saw-guide. Fig. 6 is an inverted plan view, partly in section, of the saw-guide. Fig. 7- is avertical transverse section of the saw-filing machine, showing. the attachment for holding and guid-' ing band-saws; Fig. 8 is a vertical transverse section of the machine, showing the device for holding circular saws in position for filing. 1 Fig. 9 .is a horizontal section taken on line qq u in Fig. 8. I Fig. 10 is an edge view of the rotary file. Fig. 11 is an enlarged transverse section of the edge. of the rotary file, andtFig. 12 is a partial side elevation of the rotary file.

Similar letters of reference indicate corre spending parts in all the views. g

' The object of my invention is to construct a machine for quickly and accurately filing all varieties of saws, including circular, crosscut, and rip saws, long saws, and band-saws.

My inventionconsists in a rotary file having a segment removed and replaced by an adj ustable plainfaced cam for automatically feeding the'tceth of-the saw forward and in mechanism forholdingand guidingsaws of differentkinds.

It also further consists in a rotary filehaving a beveled concave edge for filing straight teeth on bevel-toothed saws held diagonally across the plane of rotation of the file.

The circular file A is fitted to the stud B, projecting axially into the chamber a of the main frame 0. To the stud B is also fitted a bevel-wheel, C, which is attachedto the, ro-

tary file A by means of'screws 1. In the ears' 0*, projecting from the main frame, is jour- 5o naled a shaft, 0 whichcarries abevel-pinion,

Gj, engaging with the bevel-wheelG Upon the shaft Q is placed a hand-crank,fO which ismade adjustable. along the length of the shaft 0 The frame Gisprovided withafoot,

0 for contact with the bench to which the machine issecured, the frame 0 beingpr'o vided with a rightangled arm, 0*, through which passes a clamping-screw, c, for binding the machine to the bench.

Theedgeof therotary file A is beveled conform to the space between the'teeth of the particular saw to' 'be filed, and a segment of the file is removed, forming a recess,*;j, in one end of which is secured a cam,"A by 'rivets Y j,- the said cam being of spring material and 6 conforming to thecurvature of theperiphery of the file, but bent laterally in th'efform of a reversed curve, the fixed end of the camicoinciding with the ridge or highest p'art of the 1 wheel and the free end b'eing'laterally removed" 70, I

fron'rthe'ridge of the wheel a distance equal to the length of the base of oneor two of'the teethof the saw to be filed. A screw, A is I inserted in the side of the rotary file A opposite the free end j of the spring-cam A and 7 'is swiveledin the end of the saidspring-cam, I

so that by turning th'escrew A the springcam A may be adj usted according to'the requirements of the work.

In the top'of the fr upon one side of which i'spivoted a saw-guide, 3, upon the stud d, the guide consistingof the lower part, D provided with the-down wardlyprojecting semi-cylindrical boss 4,

which is recei'v'edinfa recess of corresponding 8 5 'form made in theito'p of the frame 0, concen-; 1

tric with the'pivot d. In the boss 4is formed 7 aslot, 5, in which is pivoted a curvedbar, d, upon thefpind Ina hole,- f, bored in the frame 0 at right anglesto the bar d, is ingo .serted a bolt,f, provided with a'hook, f, adapted to engage thebar-d*, and uponthe outer end of the bolt f 'i's placed a wingnut, f ,--b.y turning which the bar (1 may be clamped in any desired position, thus holding thelower 95 part, D of thesaw-guide atany desired angle with reference to the rotary file A." Upon the lower part, D, of I the saw-guide ame C is formed aslot,'2, so;

rod 6. The upper part, D, of the. saw-guide consists of a plate having a groove, 11, in its free edge for receiving the hand-saw carrier, which will presently be described. To the lower part, D, of the vsaw-guide issecured a screw-threaded stud, gflwhich extends upward above the face of the part D, and receives a flat spring, 9, which may be made to bear with more or less pressure upon the top of the part D by means of the wing-nut g To the top of the frame 0, upon the opposite side of the slot 2, is secured a gage, E, having a slotted arm, h, by means of the thumb screw h", passing through the slot h of the gage into the top of the frame.

.The hand-saw carrier consists of two bars, G G which are clamped together upon the sides of the saw to be filed by screws 1-, passing. through yokes G If the saw is to be filed straight across, the saw-guide 3.is arranged at right angles to the plane of the rotary file A,

and the spring-cam A is adjusted so that the distance between its free extremity and the ridge of the rotary file will be equal to the length of the base of one tooth of the saw. The saw-carrier is then inserted in the saw-guide, and thefile A is rotated by turning the crank G,

. when the file by one revolution files onetooth,

and by means of the cam A moves the sawinto position for filing the second tooth, and. so on. In the case of a bevel-toothed saw it is necessary to arrange the saw-guide so as to direct the saw in a diagonal path across theedge of the rotary file A and to adjust the cam A so that only alternate teeth will be filed in passing the saw through the. machine with one adjustment of the saw-guide, when by arranging the saw-guide oppositely with respect to its first position the saw is. again passed through the machine, filing the intermediate teeth. In addition to this change of adjustment for bevel-toothed saws the file itself must necessarily be of a different form from that employed in filing straight across the saw.

It is well known that the lineof the intersectionof an oblique plane with a cone or conical surface is curved. Thus it is evident that if a saw were passed obliquely across a trulyconical rotary file the edge of the tooth would be made concave. To correct this error in fil-' ing bevel-toothed saws, I make the beveled surfaces of the rotary file concave, as shown in Figs. 10 and 11, so that a saw held obliquely upon theedge of the rotary file will have its teeth filed approximately straight.

To adapt my improved machine for filing band-saws, I provide a guide, D, consisting of a bar bent twice at right angles in the same direction, forming arms G which support adj ustable grooved rollers m, over which the band saw passes. The guide D is held in'the slot (1 of the saw guide 3 by a clamp, m, held by a thumb-screw, m, entering the boss 4.

For filing circular saws, a grooved standard, H, is inserted in a hole, n, bored in the top of the frame 0. To the standard H is fitted a bracket, H provided with a feather fitted to the slot of the standard and furnished with a thumb-screw, q, for clamping the bracket at any desired height. The horizontal arm P of thebracket H is slotted to receive an arbor, H upon which the circular saw is mounted, and which is provided with a washer, H, having studs r, adapted to enter holes in the saw to be filed. The teeth of the saw are operated upon in the same manner as in the cases before described, the saw turning on the arbor H as the operation of filing progresses.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A circular-saw file having bevel concaved filingsurfaces for filing bevel-toothed saws,

substantially as herein specified.

2. In a saw-filing machine, the combination,

with a rotary saw-file, A, provided with a feedthe boss 4, the upper part, D, pivoted between the ears d and provided with a longitudinal groove, (1, and the gage E, adj ustably secured to the frame 0, substantially as specified.

3. The combination, with thelboss 4 of the saw-guide 3, of the bar d and the clampingbolt f substantially as specified.

4. In a saw-filing machine, the combination,

' with the saw-guide 3, of the saw-carrier formed of the bars G G and clamps Gt, substantially asspecified.

5. In a saw-filing machine, the combination,

with the frame 0, provided with the socket n, of the standard H, the slotted bracket H, and the arbor H substantially as specified. 6. In a saw-filing machine, the combination, with the saw-guide 3, of the bar D, bent twice at right angles and carrying adj nstable sawguiding rollers m, substantially as specified.

7. In a saw-filing machine, the combination, with the rotary file A, provided with the adjustable feeding-cam A, of the bevel-wheel C, the bevel-pinion G, the shaft 0, the crank 0, adjustable on the shaft 0 the frame 0, and the supports for the rotary file A, the bevelwheel 0 and the shaft 0 substantially as specified.

DAVID WASHBURN JOHNS.

Witnesses:

HENDERSON E. DAVIS, JAMES RoEsER. 

